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| 300 psi compressor ?? |
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| picclock:
Possibly not the correct forum - mod please feel free to move. I'm struggling to get a 300psi low air volume compressor. I need this to set/check safety valves and proof/leak test some equipment which will run at 160psi or less. In my ignorance I bought one of these 12v 300 psi car inflater type pumps, but even with the hose blocked off and no leaks it barely makes 200 psi - I would send it back but it was so cheap its just not worth it. I've had a couple of crazy thoughts, like making an air powered pressure step up device, or enclosing duff pump in housing and pressurising the housing from my main compressor (100-130 psi) thus adding that pressure to the output. Considered using CO2 but the volume of the device is quite large, and I may have to do this test many times before I am satisfied (some of the home brew sites state a CO" cylinder can be picked up for as little as £17 - If this is the case then that may be the simplest option). Any advice or suggestions most welcome. Best Regards picclock |
| awemawson:
Those Chinese 'pounds per square inch' just don't come up to standard compared to British ones :bugeye: |
| Pete.:
Bloody dangerous proof-testing with compressed air. What you going to do if it fails the test? Fill whatever you are testing to the brim with water and gently warm it up. Pressure will soar without the inherent dangers of an uncontrolled release of compressed air. If there's a failiure all you'll get is a dribble of water not flying parts. |
| picclock:
@ pete Your quite right. The main assembly has already been proof tested using paraffin and a hand pump I made, however some parts can not be tested under those conditions. So this final test is to check rotating mechanical seals and other fittings, all rated well in excess of these pressures. As an aside I used this method with water once and pumped up this job to 400 psi. I thought I would let it sit a while and check for any pressure loss. So I went to have a coffee and the sun came out from behind the clouds and brightly shone on my test piece. When I got back the pressure was heading northward of 900 psi :bugeye: - way over the limits - so I don't leave things like that anymore. @awemawson Even the gauge on this chinese pump reads about 20 psi low so I guess that goes with the low output. To be fair it was very cheap and is probably fine for inflating tires and stuff. Best Regards picclock |
| Pete.:
Aah, sorry to presume your ignorance of the dangers, ut so many just don't realise. Better to be said so that others also understand. |
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